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Arab Board Ophthalmology Final Written study materials
Arab Board Ophthalmology Final Written study resources

Arab Board Ophthalmology Final Written practice questions

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Question 1Cornea, External Disease and Anterior Segment

A 24-year-old contact lens wearer presents with a 6 mm corneal epithelial defect, a ring-shaped stromal infiltrate, and severe pain out of proportion to findings. Which organism is most strongly associated with this presentation?

  1. Staphylococcus epidermidis
  2. Acanthamoeba
  3. Pseudomonas aeruginosa Correct answer.
  4. Herpes simplex virus

Explanation

Pseudomonas keratitis classically follows contact lens wear and produces a rapidly progressive suppurative infiltrate with a ring abscess and marked pain. The ring infiltrate reflects intense stromal necrosis and neutrophil recruitment. Prompt intensive anti-pseudomonal therapy is required because of the risk of perforation.

Question 2Cornea, External Disease and Anterior Segment

Which corneal layer is primarily responsible for the majority of the cornea's tensile strength?

  1. Bowman layer
  2. Epithelium
  3. Stroma Correct answer.
  4. Endothelium

Explanation

The stroma constitutes about 90% of corneal thickness and its highly organized collagen lamellae provide most tensile strength. The epithelium and endothelium are cellular monolayers with little mechanical contribution. Bowman layer contributes minimally to strength.

Question 3Cornea, External Disease and Anterior Segment

A patient with advanced keratoconus is being counseled about corneal cross-linking. Which statement best describes the mechanism of riboflavin/UVA cross-linking?

  1. It induces covalent cross-links between stromal collagen fibrils Correct answer.
  2. It replaces diseased endothelium with donor cells
  3. It removes the abnormal anterior stroma by controlled excimer ablation
  4. It flattens the cornea by inserting intrastromal ring segments

Explanation

Riboflavin acts as a photosensitizer that, when activated by UVA, generates reactive oxygen species that form covalent bonds between collagen molecules. This increases stromal stiffness and slows or halts ectasia progression. It does not ablate tissue or alter endothelial cell populations.

Question 4Cornea, External Disease and Anterior Segment

A 60-year-old with chronic blepharitis develops a corneal ulcer with a feathery leading edge and a hypopyon. Which management step is most appropriate initially?

  1. Corneal scraping for culture and intensive topical antibiotics Correct answer.
  2. Topical corticosteroid alone
  3. Topical antiviral therapy
  4. Immediate penetrating keratoplasty

Explanation

Corneal ulcers with hypopyon require corneal scraping for Gram stain and culture to guide therapy, followed by intensive broad-spectrum topical antibiotics. Empiric steroids alone risk worsening infection. Surgery is reserved for perforation or non-healing cases.

Question 5Cornea, External Disease and Anterior Segment

Which finding is most characteristic of a Mooren ulcer?

  1. Diffuse corneal edema with endothelial guttae
  2. Painful peripheral corneal ulceration with overhanging edges and spared sclera Correct answer.
  3. Painless central corneal thinning with lipid deposition
  4. Ring-shaped stromal infiltrate after contact lens wear

Explanation

Mooren ulcer is a painful, idiopathic peripheral corneal ulceration with a characteristic overhanging edge and undermined margin, and the sclera is spared. It is a diagnosis of exclusion after infectious and systemic causes are ruled out.

Question 6Cornea, External Disease and Anterior Segment

A 35-year-old presents with a painful red eye, dendritic epithelial lesion, and a history of recurrent cold sores. Which topical agent is first-line therapy?

  1. Topical acyclovir ointment
  2. Topical trifluridine Correct answer.
  3. Topical prednisolone acetate
  4. Topical ganciclovir gel

Explanation

Topical trifluridine is a standard first-line topical antiviral for epithelial herpes simplex keratitis in many settings, along with topical ganciclovir where available. Corticosteroids are contraindicated in active epithelial disease because they promote viral replication. Systemic antivirals are also used but are not listed here.

Question 7Cornea, External Disease and Anterior Segment

Which systemic condition is most strongly associated with peripheral corneal thinning and ulceration in a young adult?

  1. Diabetes mellitus
  2. Systemic lupus erythematosus
  3. Granulomatosis with polyangiitis Correct answer.
  4. Rheumatoid arthritis

Explanation

Granulomatosis with polyangiitis classically causes peripheral ulcerative keratitis, often with scleritis, in younger adults. Rheumatoid arthritis is more typically associated with peripheral ulcerative keratitis in older patients with long-standing disease.

Question 8Cornea, External Disease and Anterior Segment

A patient with keratoconus is being evaluated for intrastromal corneal ring segments. Which finding is the strongest contraindication?

  1. Steep keratometry of 52 diopters
  2. Central corneal thickness of 480 microns
  3. History of herpetic keratitis Correct answer.
  4. Moderate astigmatism

Explanation

Active or prior herpetic keratitis is a contraindication to intrastromal ring segment implantation because of the risk of reactivation and poor wound healing. Thin corneas and steep keratometry are relative considerations but not absolute contraindications.

Question 9Cornea, External Disease and Anterior Segment

Which corneal dystrophy is characterized by bilateral, symmetric, fine dot-like opacities in the anterior stroma that may cause recurrent erosions?

  1. Granular dystrophy Correct answer.
  2. Fuchs endothelial dystrophy
  3. Macular dystrophy
  4. Lattice dystrophy

Explanation

Granular dystrophy presents with discrete, sharply demarcated granules in the anterior stroma that may erode through the epithelium causing recurrent corneal erosions. Macular and lattice dystrophies have different patterns and deeper involvement.

Question 10Cornea, External Disease and Anterior Segment

A patient with a history of trachoma presents with trichiasis and entropion. Which management is most appropriate for the trichiasis?

  1. Topical corticosteroid drops
  2. Observation
  3. Epilation followed by definitive surgical correction Correct answer.
  4. Topical antibiotic therapy alone

Explanation

Trichiasis in trachoma requires definitive correction, usually surgical, after temporary epilation for symptomatic relief. Topical antibiotics treat active infection but do not correct misdirected lashes.

Question 11Cornea, External Disease and Anterior Segment

Which of the following best describes the primary defect in Fuchs endothelial corneal dystrophy?

  1. Abnormal collagen cross-linking in the stroma
  2. Defective epithelial basement membrane adhesion
  3. Accelerated endothelial cell loss with abnormal Descemet membrane Correct answer.
  4. Deficiency of keratan sulfate in the stroma

Explanation

Fuchs dystrophy is characterized by accelerated endothelial cell loss and formation of guttae on a thickened Descemet membrane, leading to corneal edema. Stromal and epithelial defects are secondary consequences of endothelial failure.

Question 12Cornea, External Disease and Anterior Segment

A patient with a corneal abrasion is treated with topical antibiotics and a bandage contact lens. Two days later, the eye is more painful with a worsening epithelial defect. Which complication should be suspected?

  1. Fungal keratitis
  2. Bacterial keratitis Correct answer.
  3. Herpetic keratitis
  4. Acanthamoeba keratitis

Explanation

Worsening pain and an enlarging epithelial defect in a patient using a bandage contact lens raise concern for bacterial keratitis, particularly Pseudomonas. The lens provides a nidus for infection and should be removed for culture and treatment.

Question 13Cornea, External Disease and Anterior Segment

Which of the following is a recognized risk factor for the development of pterygium?

  1. Diabetes mellitus
  2. Chronic use of topical beta-blockers
  3. High myopia
  4. Chronic ultraviolet light exposure Correct answer.

Explanation

Pterygium is strongly associated with chronic ultraviolet light exposure, which is why it is more common in equatorial and outdoor-working populations. Other listed factors are not established risk factors.

Question 14Cornea, External Disease and Anterior Segment

A patient with severe dry eye and filamentary keratitis is being managed. Which topical therapy is most appropriate as a first step?

  1. Topical antiviral ointment
  2. Preservative-free artificial tears and lubricants Correct answer.
  3. Topical antibiotic drops
  4. Topical corticosteroid as monotherapy

Explanation

Filamentary keratitis in dry eye is managed initially with aggressive lubrication using preservative-free artificial tears and ointments. Corticosteroids may be added short-term for inflammation but are not first-line monotherapy.

Question 15Cornea, External Disease and Anterior Segment

Which of the following best describes the principle of Descemet membrane endothelial keratoplasty (DMEK)?

  1. Replacement of the anterior stroma
  2. Replacement of only the Descemet membrane and endothelium Correct answer.
  3. Replacement of the epithelium and Bowman layer
  4. Replacement of the full-thickness cornea

Explanation

DMEK selectively replaces Descemet membrane and endothelium, leaving the patient's stroma and epithelium intact. This provides faster visual recovery and lower rejection risk compared with penetrating keratoplasty.

Question 16Cornea, External Disease and Anterior Segment

A patient presents with a corneal foreign body and a rust ring after grinding metal. Which management step is most appropriate?

  1. Apply a tight pressure patch without removal
  2. Prescribe topical corticosteroid alone
  3. Remove the rust ring with a burr under magnification Correct answer.
  4. Leave the rust ring to resorb spontaneously

Explanation

Rust rings should be removed with a corneal burr under magnification to prevent persistent epithelial defect and inflammation. Leaving the ring can delay healing and cause scarring.

Question 17Cornea, External Disease and Anterior Segment

Which corneal finding is most consistent with Terrien marginal degeneration?

  1. Central corneal ulcer with hypopyon
  2. Diffuse punctate epithelial erosions
  3. Ring infiltrate with hypopyon
  4. Superior peripheral corneal thinning with lipid and vascularization Correct answer.

Explanation

Terrien marginal degeneration is characterized by painless, progressive superior peripheral corneal thinning with lipid deposition and vascularization. It is distinct from Mooren ulcer, which is painful and involves the inferior periphery more often.

Question 18Cornea, External Disease and Anterior Segment

Which of the following is the most common cause of infectious keratitis in contact lens wearers?

  1. Pseudomonas aeruginosa Correct answer.
  2. Staphylococcus aureus
  3. Herpes simplex virus
  4. Fusarium species

Explanation

Pseudomonas aeruginosa is the most common cause of contact lens-associated microbial keratitis, particularly with soft lens wear and poor hygiene. Fungal causes such as Fusarium are less common but associated with specific outbreaks.

Question 19Cornea, External Disease and Anterior Segment

A patient with keratoconus and a thin cornea is being evaluated for corneal collagen cross-linking. Which parameter is most important to confirm before proceeding?

  1. Refractive cylinder
  2. Pupil size
  3. Tear film breakup time
  4. Corneal thickness at the thinnest point Correct answer.

Explanation

Corneal thickness at the thinnest point determines whether the standard epithelium-off protocol can be safely performed without excessive endothelial UVA exposure. Very thin corneas may require modified protocols such as hypo-osmolar riboflavin or contact lens-assisted techniques.

Question 20Cornea, External Disease and Anterior Segment

Which of the following statements about the corneal endothelium is correct?

  1. It is permeable to large proteins
  2. It has limited regenerative capacity and relies on cell enlargement and migration Correct answer.
  3. It regenerates rapidly after injury by mitosis
  4. It is derived from the neural crest and does not pump fluid

Explanation

Human corneal endothelial cells have very limited mitotic capacity in vivo; after injury, remaining cells enlarge and migrate to cover the defect. This is why endothelial cell loss is cumulative and why endothelial disease leads to edema.

Question 21Cornea, External Disease and Anterior Segment

A 70-year-old with long-standing rheumatoid arthritis develops a painful peripheral corneal ulcer with scleritis. Which underlying mechanism best explains the corneal melting?

  1. Immune complex deposition and protease-mediated stromal degradation Correct answer.
  2. Direct bacterial invasion
  3. Fungal hyphae invading the stroma
  4. Viral replication in the epithelium

Explanation

Peripheral ulcerative keratitis in rheumatoid arthritis is driven by immune complex deposition and release of matrix metalloproteinases that degrade stromal collagen. This is an immune-mediated process rather than direct infection.

Question 22Cornea, External Disease and Anterior Segment

Which topical medication is most likely to cause corneal epithelial toxicity manifesting as punctate keratopathy?

  1. Preservative-free artificial tears
  2. Topical atropine
  3. Topical timolol
  4. Benzalkonium chloride-preserved drops Correct answer.

Explanation

Benzalkonium chloride is a common preservative that causes dose-dependent epithelial toxicity, presenting as punctate keratopathy and delayed healing. Preservative-free formulations reduce this risk.

Question 23Cornea, External Disease and Anterior Segment

A patient is diagnosed with a corneal perforation after a chemical injury. Which initial management is most appropriate?

  1. Observation with pressure patching
  2. Topical antibiotic alone
  3. Immediate cyanoacrylate tissue adhesive with bandage contact lens Correct answer.
  4. Topical corticosteroid every hour

Explanation

A corneal perforation requires tectonic support, typically with cyanoacrylate tissue adhesive and a bandage contact lens, while definitive repair is planned. Topical steroids are contraindicated in the acute setting because they impair healing and increase infection risk.

Question 24Cornea, External Disease and Anterior Segment

Which of the following is the most appropriate first-line treatment for a patient with a mild chemical burn of the cornea and conjunctiva?

  1. Pressure patching without irrigation
  2. Topical antibiotic ointment only
  3. Topical corticosteroid without irrigation
  4. Immediate copious irrigation with saline or Ringer solution Correct answer.

Explanation

Immediate copious irrigation is the cornerstone of chemical burn management, removing the offending agent and restoring normal pH. Irrigation should begin before any other intervention.

Question 25Glaucoma

Which angle structure is the primary site of aqueous outflow resistance in the normal eye?

  1. Collector channels
  2. Trabecular meshwork Correct answer.
  3. Ciliary body stroma
  4. Schlemm canal

Explanation

Most outflow resistance is generated at the juxtacanalicular trabecular meshwork, where aqueous must pass before entering Schlemm canal. Downstream structures contribute comparatively little to normal resistance.

Question 26Glaucoma

A 62-year-old has intraocular pressure of 28 mmHg in both eyes, open angles on gonioscopy, and a normal-appearing optic disc with no visual field defect. Which diagnosis fits best?

  1. Primary angle-closure glaucoma
  2. Normal-tension glaucoma
  3. Primary open-angle glaucoma
  4. Ocular hypertension Correct answer.

Explanation

Ocular hypertension requires elevated pressure with open angles and no evidence of glaucomatous optic neuropathy or field loss. Once disc or field damage is present the diagnosis becomes glaucoma.

Question 27Glaucoma

Which finding on gonioscopy indicates that the angle is appositionally closed rather than merely narrow?

  1. Peripheral iris touching the trabecular meshwork Correct answer.
  2. Heavy pigmentation of Schwalbe line
  3. Blood in Schlemm canal on pressure
  4. Presence of a prominent ciliary body band

Explanation

Appositional closure is defined by iris contacting the angle structures without permanent synechiae. Indentation gonioscopy distinguishes this from synechial closure, where the iris remains adherent.

Question 28Glaucoma

Which optic disc feature is most characteristic of glaucomatous damage?

  1. Increased cup-to-disc ratio with rim thinning Correct answer.
  2. Peripapillary atrophy alone
  3. Nasalization of the neuroretinal rim
  4. Disc hyperemia with blurred margins

Explanation

Glaucomatous cupping reflects loss of retinal ganglion cell axons, producing cup enlargement and progressive neuroretinal rim thinning, often following the ISNT rule. The other features are nonspecific or suggest other disorders.

Question 29Glaucoma

A patient with open-angle glaucoma has a mean intraocular pressure of 15 mmHg on maximal tolerated medical therapy, but visual field loss continues. What is the most appropriate next step?

  1. Consider incisional glaucoma surgery such as trabeculectomy Correct answer.
  2. Repeat field testing only
  3. Observe for another year before changing therapy
  4. Add a topical prostaglandin analogue

Explanation

Progressive glaucomatous damage despite a pressure at target on maximal medical therapy indicates the target is inadequate. Surgical intervention to lower pressure further is appropriate rather than continued observation.

Question 30Glaucoma

Which mechanism best explains the raised intraocular pressure in primary open-angle glaucoma?

  1. Excess aqueous production by the ciliary epithelium
  2. Raised episcleral venous pressure
  3. Increased resistance to outflow through the trabecular meshwork Correct answer.
  4. Obstruction of aqueous flow at the pupil

Explanation

Primary open-angle glaucoma arises from increased resistance to aqueous outflow at the trabecular meshwork despite an open angle. Aqueous production and episcleral venous pressure are typically normal.

Question 31Glaucoma

Which class of topical agent lowers intraocular pressure chiefly by increasing uveoscleral outflow?

  1. Alpha-2 adrenergic agonists
  2. Carbonic anhydrase inhibitors
  3. Beta-adrenergic antagonists
  4. Prostaglandin analogues Correct answer.

Explanation

Prostaglandin analogues such as latanoprost increase uveoscleral outflow and are first-line therapy for open-angle glaucoma. Other classes reduce production or enhance conventional outflow.

Question 32Glaucoma

A patient on topical timolol develops wheeze and a resting heart rate of 48 beats per minute. What is the most appropriate action?

  1. Increase the frequency of timolol
  2. Continue the drug and monitor
  3. Discontinue the beta-blocker and choose an alternative class Correct answer.
  4. Add a second beta-blocker

Explanation

Bronchospasm and bradycardia are recognised systemic effects of topical beta-blockers from nasolacrimal absorption. The drug should be stopped and an agent without cardiopulmonary effects substituted.

Question 33Glaucoma

Which finding most strongly suggests that a patient with a shallow anterior chamber has an acute primary angle-closure attack?

  1. Sectoral iris atrophy with normal pressure
  2. Bilateral clear corneas with normal pupils
  3. Unilateral red painful eye with mid-dilated fixed pupil and hazy cornea Correct answer.
  4. Gradual painless field loss over years

Explanation

Acute angle closure presents with severe ocular pain, headache, blurred vision, a mid-dilated non-reactive pupil, corneal oedema and markedly raised pressure. The other descriptions fit chronic or different conditions.

Question 34Glaucoma

Which laser procedure is used to relieve pupillary block in a patient with primary angle closure?

  1. Laser peripheral iridotomy Correct answer.
  2. Selective laser trabeculoplasty
  3. Cyclophotocoagulation
  4. Argon laser trabeculoplasty

Explanation

Pupillary block is relieved by creating a peripheral iridotomy, which allows aqueous to bypass the pupil and equalise pressure between anterior and posterior chambers. Trabeculoplasty addresses meshwork outflow, not pupillary block.

Question 35Glaucoma

A 70-year-old has elevated intraocular pressure, a shallow angle with a patent peripheral iridotomy, and a dense cataract. Which mechanism of angle closure should be suspected?

  1. Pupillary block
  2. Aqueous misdirection
  3. Phacomorphic angle closure Correct answer.
  4. Plateau iris syndrome

Explanation

An enlarged or intumescent lens can push the iris forward and close the angle even after a patent iridotomy has relieved pupillary block. This is phacomorphic angle closure and is treated by cataract extraction.

Question 36Glaucoma

Which gonioscopic appearance is typical of pigment dispersion syndrome?

  1. A flat iris plane with a narrow approach
  2. A thin ciliary body band with no pigment
  3. Peripheral anterior synechiae with neovascularisation
  4. Dense homogeneous pigmentation of the trabecular meshwork with mid-peripheral iris transillumination defects Correct answer.

Explanation

Pigment dispersion shows heavy, uniform trabecular pigmentation with radial iris transillumination defects from iris-zonule rubbing. The pigment is deposited broadly across the meshwork rather than in a patchy pattern.

Question 37Glaucoma

A patient with long-standing poorly controlled diabetes presents with iris neovascularisation, elevated intraocular pressure and a closed angle. What is the primary mechanism of glaucoma here?

  1. Trabecular obstruction by red blood cells
  2. Pupillary block from a swollen lens
  3. Fibrovascular tissue contracting across the angle Correct answer.
  4. Excess aqueous production

Explanation

Neovascular glaucoma develops when fibrovascular membranes grow into the angle and contract, causing synechial closure and raised pressure. Early treatment targets the underlying retinal ischemia with panretinal photocoagulation and anti-VEGF therapy.

Question 38Glaucoma

Which form of glaucoma is most common in sub-Saharan Africa and often presents with advanced damage at first visit?

  1. Pseudoexfoliation glaucoma
  2. Primary congenital glaucoma
  3. Primary open-angle glaucoma Correct answer.
  4. Angle-closure glaucoma

Explanation

Primary open-angle glaucoma is the most prevalent form globally and in African populations, often diagnosed late with severe cupping. Screening and awareness remain important because symptoms are absent until late.

Question 39Glaucoma

Which feature distinguishes pseudoexfoliation glaucoma from primary open-angle glaucoma?

  1. Normal intraocular pressure throughout
  2. Younger age at onset with myopia
  3. Absence of pigment on the trabecular meshwork
  4. Dandruff-like material on the lens capsule and pupillary margin with weak zonules Correct answer.

Explanation

Pseudoexfoliation syndrome shows characteristic fibrillar material on the anterior lens capsule and pupillary margin, with zonular weakness and often rapid pressure rises. It is associated with older age and more severe progression.

Question 40Glaucoma

Which parameter is the most important modifiable risk factor for progression of glaucomatous optic neuropathy?

  1. Refractive error
  2. Intraocular pressure Correct answer.
  3. Corneal diameter
  4. Iris colour

Explanation

Intraocular pressure is the only major risk factor that can be modified, and lowering it slows progression. Other listed factors are static and not therapeutic targets.

Question 41Glaucoma

A patient with a thin central corneal thickness of 480 micrometres has an intraocular pressure of 18 mmHg by applanation. How should this be interpreted?

  1. True pressure may be higher than measured Correct answer.
  2. True pressure is certainly lower than measured
  3. Corneal thickness has no effect on applanation
  4. The reading is invalid and should be discarded

Explanation

Applanation underestimates intraocular pressure in thin corneas because less force is needed to flatten them. Thin corneas are also an independent risk factor for glaucoma progression.

Question 42Glaucoma

Which test provides a structural measure of retinal ganglion cell loss that complements visual field testing in glaucoma?

  1. Fluorescein angiography
  2. Corneal topography
  3. Electroretinography
  4. Optical coherence tomography of the retinal nerve fibre layer Correct answer.

Explanation

Optical coherence tomography quantifies peripapillary retinal nerve fibre layer and ganglion cell complex thickness, detecting structural loss that may precede field defects. It is a standard adjunct to perimetry.

Question 43Glaucoma

A patient develops a flat anterior chamber with a very high intraocular pressure two days after trabeculectomy. What is the most likely diagnosis?

  1. Choroidal detachment with low pressure
  2. Endophthalmitis
  3. Aqueous misdirection Correct answer.
  4. Wound leak with hypotony

Explanation

Aqueous misdirection presents with a uniformly shallow or flat anterior chamber and markedly elevated pressure after surgery, often with a patent iridotomy. Treatment includes cycloplegics and aqueous suppressants, with surgery in refractory cases.

Question 44Glaucoma

Which combination best describes the target of a trabeculectomy with mitomycin C?

  1. Implanting a tube into the vitreous cavity
  2. Opening the trabecular meshwork with a laser
  3. Creating a guarded fistula from anterior chamber to subconjunctival space Correct answer.
  4. Destroying the ciliary body to reduce aqueous production

Explanation

Trabeculectomy creates a partial-thickness scleral flap over a fistula into the subconjunctival space, with antifibrotic agents improving bleb survival. Aqueous then drains into the subconjunctival and orbital tissues.

Question 45Retina and Vitreous

A healthy 68-year-old notices a sudden shower of floaters followed by a curtain-like shadow over the temporal visual field. Which structure is most likely detached?

  1. The neurosensory retina Correct answer.
  2. The choroid
  3. The retinal pigment epithelium
  4. The vitreous cortex only

Explanation

A sudden shower of floaters with a peripheral field defect is the classic presentation of a rhegmatogenous retinal detachment, in which the neurosensory retina separates from the retinal pigment epithelium. Choroidal detachment causes shallowing and does not produce photopsia with floaters. Isolated vitreous detachment causes floaters and photopsia but not a curtain-like field loss.

Question 46Retina and Vitreous

Which type of retinal detachment is caused by a full-thickness retinal break with vitreous fluid entering the subretinal space?

  1. Rhegmatogenous detachment Correct answer.
  2. Tractional detachment
  3. Serous detachment
  4. Exudative detachment

Explanation

Rhegmatogenous detachment is defined by the presence of a retinal break through which liquefied vitreous gains access to the subretinal space. Exudative and serous detachments result from fluid accumulation without a break. Tractional detachment results from fibrovascular membranes pulling the retina.

Question 47Retina and Vitreous

Which retinal finding is the earliest ophthalmoscopic sign of diabetic retinopathy?

  1. Neovascularization at the disc
  2. Tractional retinal detachment
  3. Vitreous hemorrhage
  4. Microaneurysms Correct answer.

Explanation

Microaneurysms are the earliest visible lesion of diabetic retinopathy, appearing as small red dots before other changes develop. Neovascularization, vitreous hemorrhage and tractional detachment are features of advanced proliferative disease.

Question 48Retina and Vitreous

Which layer of the retina is primarily affected by the accumulation of lipofuscin in age-related macular degeneration?

  1. Retinal pigment epithelium Correct answer.
  2. Nerve fiber layer
  3. Ganglion cell layer
  4. Inner limiting membrane

Explanation

Lipofuscin accumulates within retinal pigment epithelial cells as they phagocytose shed photoreceptor outer segments, and this accumulation is central to AMD pathogenesis. The nerve fiber, ganglion cell and inner limiting layers are not the site of lipofuscin storage.

Question 49Retina and Vitreous

A patient with a retinal vein occlusion and macular edema is being assessed. Which imaging modality best quantifies macular thickening?

  1. Fluorescein angiography
  2. Optical coherence tomography Correct answer.
  3. Indirect ophthalmoscopy
  4. B-scan ultrasonography

Explanation

Optical coherence tomography provides cross-sectional retinal imaging that directly measures macular thickness and detects intraretinal fluid. Fluorescein angiography shows vascular leakage but does not quantify thickness. B-scan ultrasound and indirect ophthalmoscopy lack the resolution for macular thickness measurement.

Question 50Retina and Vitreous

Which of the following is a classic symptom of a posterior vitreous detachment?

  1. Painless loss of color vision
  2. Painful red eye
  3. Photopsia with floaters Correct answer.
  4. Monocular diplopia

Explanation

Posterior vitreous detachment commonly presents with sudden floaters and flashes of light (photopsia) as the vitreous separates from the retina. Pain and redness suggest anterior segment disease. Monocular diplopia and isolated color vision loss are not typical of vitreous detachment.